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, Reissued Mar. 28, 1922.-

F. G. WARBURTON. coumoume MEANS FOR ELECTRIC MOTORS.

APPLICATION FILED JAN. 18. I922.

I za FIG. 6'.

23 Z8 lrmsn/ar B Haifa/10120 I UNITED STATES PATENT OFFICE.

FRANK ennavns wAnBUnroN, or mNcnnsrna, ENGLAND.

CONTROLLING- MEANS ron. nrlnc'riuc MOTORS.

reissue filed January 18,

To all whom it may concern:

Be it known that I, FRANK Gnnavns WAR- BUn'roN, a subject of the King of Great Britain, and resident of the city of Manchester, in England, have invented certain new and useful Improvements in Controlling Means for Electric Motors, of which the following is a full, clear, and exact description.

This invention relates to improvements in means of controlling electric motors and the like, and has the same objects, and is, generally speaking, adapted for the same purposes as the apparatus described in my application, Serial No. 7550, filed February 11th, 1915, of which application the present is a continuation in part.

The particular features in which the present invention differs from that shownin my former application is that this invention is adapted for use in caseswhere the differential gear set forth in my other application can be dispensed with. The present application contemplates as the elements of the regulating units regulator two shafts operated normall -at uniform speed.' As long as the uni orm speed is maintained the two shaftswill be relatively stationary. Directlyany relative angular movement takes place between these two shafts, a regulator is adjusted to counteract such angular movement.

In the drawings which illustrate the invention:'-

Fig. 1 is the diagrammatic view of the invention as applied to a paper machine 'or the like.

Fig. 2 is a diagrammatic view illustrating a slight variation from Figure 1.

Fig. 3 is a side elevation of one of the artly in section. I I 1 Fig. 4 shows diagrammatically a sli ht alteration from Figure 3' in that the resistance units are made stationary by use of 'sliprings.

1g. 5 is a diagram of a regulator commu-- tator and connection.

Referring more particularly to the drawings, 11 designates the rolls or units of a Specification of Reissued Letters Patent. Reissued Mar, 28,1922 Original No. 1,337,573, dated April 20, -1920,- Serial No. 133,685, filed November 27, 1916. Application for 1922. Serial 110. 530,812.

used to drive a master shaft 13, I'1ormally by gear. Flgure 1 shows the master shaft driven by one of the motor units. Figure 2 shows .a slight variation, the master shaft being driven by. a separate motor 12. A

regulator, designated as a whole by the nu- -meral 14, is provided for each motor to be controlled in relation to the speed of the master shaft and is mounted partly on the spur 15, from the master shaft and partly on a separate shaft 16 driven from the motor by cone pulleys. As shown in Figure 1, the spur 15 from the master shaft is driven by bevelled gear 17.- In line with it is a separate shaft 16 from the motor, the regulator being mounted o the abutting ends of these two auxiliary sha ts. It will, therefore, be I seen that if these two abutting shafts, hav- Shafts 15 and 16 are mounted on framework supported by bearings 15.and 16 respectively. The shaft 15 is drivenfrom the mastershaft 13 by means of bevelled gear 17 while the shaft 16 is driven by cone pulley mechanism 21 from "the motor 12", etc.

- These two shafts are arranged axially in line and their adjacent ends preferably have a slight clearance. On one of these two shafts, for instance, 15, is mounted a commutator 22, having any number of segments insulated normally from each other. ure 5 shows'the commutatorarranged wit three segments, one short and two long. Between these segments resistance '23 is connected, and the resistance either rotates with the commutator as shown in Figure 3, and in the original application, or is stationary as shown in Figure 4, the resistance then being connected to slip rings 24 and the brushes on the slip rings being connected to the motor. The same electrical effect is obtained in eithercase. On the shaft v16 is mounted a brush 25, which engages with the commutator, and in turn is electrically counected to a slip ring 26 mounted on the same that class of goods. If relative speed difference between the various units was not required, the shaft 16 would be either geared or coupled direct to the motorswithout the intervention .of bolts When in operation, shafts 15 and 16 are revolving quickly and the eye cannot see whether there is relative angular movement between the two shafts and therefore there should be connected between certain contacts of the resistance, as illustrated in Figure 4:, an audible or visible signal 28 inthe form of a bellor a lamp, so that when current is flowing through this resistance the signal would record. The object of this is to show whether the dutycalled for is within the capacity of they automatic regulator, if not, assistance would be given to the automatic regulator by adjusting the external field redirectly there is the slig sistance in the motor circuit in series with the regulator resistance.

The operation of the apparatus is extremely simple, and may be readily understood from the following description of operation.

For the purpose of explanation, suppose the gear is applied to a paper making machine driven by D. C. motors, and that the machine is being started up.

The whole of the paper machine would then be brought up to the average required speed by methods common to motor installations, either by altering the voltage of supply or adjusting the amount of resistance in thefields of the motors. All the belts on the cone pulleys would be adjusted accord ing to the draught required in between the different units as nearly as possible. V

Imagine now the conditions of the installation with the regulator not in circuit. Motors 12, '12", 12, 12", etc., may all be running at different speeds; the master shaft spurs may berunning'at another speed, and under these conditions, there is sure to be relative angular movement in varying degree between the different shafts 15 and 16, and such relationship of speeds will vary as conditions acting on each motor vary.

Now imaglne all the regulators 14 to be in circuit, then, when acting within the designed capacity of theregulator, there must be an equal number of revolutions of shafts 15 and 16 over anyl period of time, for

testv angular movement a proportional speed correction is applied to the motor in question and equilibrium re-established by the brush on the regulator' controlling that motor making contact with another segment of the regulator.

In practice it Wlll be found that the brush on the regulator. will move slightly backward and forward on one or more contacts, then, granted no belt slip on the cone pulleys, and there should be noslip as the pulleys have negligible power to transmit and the belt will be made relatively very heavy for the duty, the whole apparatus will act as though the motors were all geared up to the master shaft and the only'relative movement which can take place will be equivalent to the backlash of a train of gears. a u

The whole of the paper machine could be speeded up or down while running by either changing the voltage of supply to all the motors, including the master motor, or by adjusting the resistance in the field cir-, cuit of the master motor, and possibly the othermotors as well, depending on the desi ed capacity of the automatic regulator. aving thus described my invention, what I claim is a a 1. In a device of the character described,

" the combination with a seriesof motors of .regulating device for each motor arranged to be operated by speed variations between the first and second shafts pertaining to said motor, said regulating devices each comprising a resistance, a commutator includingv a short normal contact connected to an intermediate point of the resistance, "and long contacts for high and low. resistance arranged on each side of the short contact and connected to the resistance on either side of the short contact, and a brush traversing said contacts. j

2'. In a device of the character described,

the combination with a series of motors, of

a series of shafts driven thereby, adjustable connections between said motors and shafts, a second series of shafts, a common driving mean therefor operating the second shafts at the same ratio of speed as the first shafts,

an electric regulating devicefor each motor comprising a resistance, a commutator connected thereto, and a brush, "sald commutator and brush being mounted one on thefirst shaft and one on the second shaft.

'3. Means for electrofimechanically regulating the speed of one motorby the speed of another motor to maintain predetermined speed relation, comprising a field resistance regulator for the motor to be regulated in:

eluding a revoluble commutator member and i the motors and the corresponding regulator part, .a resistance, contacts on one of said regulator parts connected to various points of the resistance, and a brush carried .by the other regulator part engaging said contacts, the brush, contacts and resistance being in circuit with the field of. one of said IIIOtOIYS. i

'5. In a device of the character described, the combination with first and second motors,

' or a resistance in series with the field of the ing second motor, a rotary commutator driven by one of the motors having the contacts thereof connected to'various points of said resistance, and a rotary brush driven by the other motor positioned to travel over the commutator contacts and a speed changing device connected between one of the motors and the element driven by it.

6. In a device of the character described, the combination with a pair of motors of a pair of revoluble regulator parts connected respectively toth'e motors for revolution,

normally at: the same speed, a resistance in series with said regulator parts and with the field of one of the motors, a commutator located in one of the regulator parts and a brush traversing the commutator located in the'other regulator part whereby variation in the speed of the regulator parts due to variation in speed relation of the motors varies the resistance of the motor field and -a speed changing device connected between one of the motors and the regulator part driven by it. 4

7 Means for eleotro-mech-anically regulata series of motors to maintain pretermined regulator for each motor including a revoluble commutator member and a. revoluble brush member, a speed control element common to all motors, a driving connection between each of the motors and one of the revoluble parts of the regulator pertaining speed relation, comprising a field motor by the speed of another motor comprising a field resistance regulator for one 655. of the motors including a commutator device connected to one of the motors and a brush connected to the other motor, said commutator and brush being normally revolved at the same angular speed and a speed changing device connected between one of the motors Y and the regulator element driven by it.

9. Ina device of the cla$ described, a pair of revolving shafts, a commutator mounted on one of said shafts, a brush mounted on the other shaft, a resistance, a normal contact in the commutator con nected to an intermediate point of the resistance, and longer contacts for high and low resistance located one on each side of the normal contact and connected to the resistance at points between the ends, and an intermediate point thereof, whereby small relative angular movements of the commutator and brush will be effective to vary the re- 5 sistance in circuit. v

10. A device of the class described, com- Y prising a pair of revolving shafts adapted to be driven by separate motors, a drum mounted on one of said shafts, a circuit adapted to include the field of one of the motors and including a resistance within the drum, a commutator on one end of the drum having the contacts thereof connected to various points of the resistance, a slip ring on the opposite end of the drum electrically connected to the resistance and insulated from. the drum, a brush supplying'curre-nt-to said ring, a brush carried by the other shaft engaging said commutator,- a second slip ring electrically connected with said brush and a stationary brush supplying current to said slip ring in combination with a change speed device arranged as a driving conn'ec tion for one of the shafts,

In witness whereof, I have hereun o set m hand.-

y FRANK GREAYES WARBURTON. 

